  .navtop{
        width: 100%;
        height: 25vh;
        background: url(http://s.dddua.com/images/cdn/a1.jpg) 100% 100% no-repeat;
        color: #fff;
        line-height:25vh;
        /*padding-top: 100px;*/
        text-align: center;
        font-size: 20px;
        display: flex;
        justify-content: center;
        align-items: center;

 }
 .navtop>div{
            width: 100px;
            height: 30px;
            line-height: 30px;
            font-size: 15px;
            margin: 0 20px;
			 border-radius: 5px;
			transition:background-color 0.5s ease-in-out;
        }
.navtop>div:hover{
            text-decoration: none;
            color: #157fca;
            background-color: #fff;
           
        }